<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>title</title>
  <script>
    //    function Person(name,age,sex,weight) {
    //      this.name=name;
    //      this.age=age;
    //      this.sex=sex;
    //      this.weight=weight;
    //    }
    //    Person.prototype.sayHi=function () {
    //      console.log("您好");
    //    };
    //    function Student(score) {
    //      this.score=score;
    //    }
    //    //希望人的类别中的数据可以共享给学生---继承
    //    Student.prototype=new Person("小明",10,"男","50kg");
    //
    //    var stu1=new Student("100");
    //    console.log(stu1.name,stu1.age,stu1.sex,stu1.weight,stu1.score);
    //    stu1.sayHi();
    //
    //    var stu2=new Student("120");
    //    stu2.name="张三";
    //    stu2.age=20;
    //    stu2.sex="女";
    //    console.log(stu2.name,stu2.age,stu2.sex,stu2.weight,stu2.score);
    //    stu2.sayHi();
    //    var stu3=new Student("130");
    //    console.log(stu3.name,stu3.age,stu3.sex,stu3.weight,stu3.score);
    //    stu3.sayHi();


    //为了数据共享,改变原型指向,做到了继承---通过改变原型指向实现的继承
    //缺陷:因为改变原型指向的同时实现继承,直接初始化了属性，继承过来的属性的值都是一样的了,所以,这就是问题
    //只能重新调用对象的属性进行重新赋值,


    //解决方案:继承的时候,不用改变原型的指向,直接调用父级的构造函数的方式来为属性赋值就可以了------借用构造函数:把要继承的父级的构造函数拿过来,使用一下就可以了



    //借用构造函数:构造函数名字.call(当前对象,属性,属性,属性....);
    //解决了属性继承,并且值不重复的问题
    //缺陷:父级类别中的方法不能继承

    function Person(name, age, sex, weight) {
      this.name = name;
      this.age = age;
      this.sex = sex;
      this.weight = weight;
    }
    Person.prototype.sayHi = function () {
      console.log("您好");
    };
    function Student(name,age,sex,weight,score) {
      //借用构造函数
      Person.call(this,name,age,sex,weight);
      this.score = score;
    }
    var stu1 = new Student("小明",10,"男","10kg","100");
    console.log(stu1.name, stu1.age, stu1.sex, stu1.weight, stu1.score);

    var stu2 = new Student("小红",20,"女","20kg","120");
    console.log(stu2.name, stu2.age, stu2.sex, stu2.weight, stu2.score);

    var stu3 = new Student("小丽",30,"妖","30kg","130");
    console.log(stu3.name, stu3.age, stu3.sex, stu3.weight, stu3.score);


  </script>
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